Sotheby's said the buyer of the 2006 work "Balloon Girl", identified only as "a female European collector and a long-standing client of Sotheby's", had made a decision to continue with the purchase at the original price.
The maverick British artist posted a video on Instagram in the wake of the prank accompanied by a quote attributed to Pablo Picasso - "the urge to destroy is also a creative urge". Would its new, half-shredded form be worth less money or more, given its elevated status after the global media attention?
According to Sotheby's, the buyer commented: "When the hammer came down last week and the work was shredded, I was at first shocked, but gradually I began to realise that I would end up with my own piece of art history".
The buyer said the creation of the work was a seminal event.
The painting, which was auctioned off as part of Sotheby's "Frieze Week" contemporary art sale, will this weekend be on view at Sotheby's New Bond Street galleries in London.